OpenAI pauses frontier RL training to harden research security after OpenAI-Hugging Face incident

• OpenAI slowed frontier model scaling, citing rising cyber risk tied to an OpenAI-Hugging Face security incident.
• Two-week pause in reinforcement learning training for deployment models while research environments were hardened and red-teamed.
• Largest planned frontier RL run remains on hold pending smaller-scale training, behavior checks, safeguard validation, alignment evidence.
• Frontier inference in research clusters was paused for workloads that could execute code or use internet-access tools, then partially restored.
• Stricter security and monitoring now required for Astra workloads after preliminary evidence it may meet a critical cybersecurity capability threshold.

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